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        <h1><a href="../../../index.html">All files</a> / <a href="index.html">onliecollege/src/messageSocket</a> DMessageClientsSharedWorker.js</h1>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">//!important: remember to  clear cache  and restart browser after updated this file.
&nbsp;
import { io } from './socketio/4.0/socket.io.min.js';
&nbsp;
//we can post parameter to this :
//var w = new Worker("./Scripts/sample.js?answer=42&amp;question=ultimate");
/*
https://stackoverflow.com/questions/12381882/can-i-pass-parameters-to-js-function-when-i-create-the-new-web-workers-object/12382015
var parameters = {}
location.search.slice(1).split("&amp;").forEach( function(key_value) { var kv = key_value.split("="); parameters[kv[0]] = kv[1]; })
&nbsp;
var question = parameters['question'];
var answer = parameters['answer'];
*/
//
// let socket = io('http://127.0.0.1', {
//   path: '/mysocket',
//   transports: ['websocket', 'polling']
// });
&nbsp;
//caller:this.worker = new SharedWorker('DMessageSharedWorker.js?httpServerAddr=' + httpServerAddr + '&amp;httpProxyPath='+httpProxyPath);
&nbsp;
let parameters = <span class="cstat-no" title="statement not covered" >{}</span>
<span class="cstat-no" title="statement not covered" >location.search.slice(1).split("&amp;").forEach(<span class="fstat-no" title="function not covered" >fu</span>nction (key_value) {</span>
<span class="cstat-no" title="statement not covered" >  console.log(key_value);</span>
  var kv = <span class="cstat-no" title="statement not covered" >key_value.split("=");</span> <span class="cstat-no" title="statement not covered" >parameters[kv[0]] = kv[1];</span>
})
// 112.74.99.240
let httpServerAddr = <span class="cstat-no" title="statement not covered" >parameters['httpServerAddr'] || 'http://112.74.99.240:3001';</span>
let httpProxyPath = <span class="cstat-no" title="statement not covered" >parameters['httpProxyPath'] || '/';</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >console.log(httpServerAddr, httpProxyPath);</span>
&nbsp;
&nbsp;
let socket = <span class="cstat-no" title="statement not covered" >io(httpServerAddr, {</span>
  path: httpProxyPath,
  transports: ['websocket', 'polling']
});
&nbsp;
&nbsp;
<span class="cstat-no" title="statement not covered" >socket.on('error', console.error.bind(console));</span>
<span class="cstat-no" title="statement not covered" >socket.on('message', console.log.bind(console));</span>
&nbsp;
&nbsp;
let data = <span class="cstat-no" title="statement not covered" >[];</span>
let conns = <span class="cstat-no" title="statement not covered" >new Set();</span>
//every browser will trigger connect event
<span class="cstat-no" title="statement not covered" >self.onconnect = <span class="fstat-no" title="function not covered" >fu</span>nction (e) {</span>
  let port = <span class="cstat-no" title="statement not covered" >e.ports[0];</span>
<span class="cstat-no" title="statement not covered" >  port.rooms = new Set(); </span>//记录这个网页需要消息的所有课程（room）
<span class="cstat-no" title="statement not covered" >  conns.add(port);</span>
<span class="cstat-no" title="statement not covered" >  port.onmessage = <span class="fstat-no" title="function not covered" >fu</span>nction (ev) {</span>
    // send out to nodejs server at once when received message from browser
&nbsp;
<span class="cstat-no" title="statement not covered" >    if (ev.data.eventName == 'reportAction') {</span>
<span class="cstat-no" title="statement not covered" >      socket.emit(ev.data.eventName, ev.data.message);</span>
    } else <span class="cstat-no" title="statement not covered" >if (ev.data.eventName == 'joinRoom') {</span>
<span class="cstat-no" title="statement not covered" >      port.rooms.add(ev.data.message.currNo);</span>
<span class="cstat-no" title="statement not covered" >      socket.emit(ev.data.eventName, ev.data.message);</span>
    } else <span class="cstat-no" title="statement not covered" >if (ev.data.eventName == 'leaveRoom') {</span>
<span class="cstat-no" title="statement not covered" >      port.rooms.delete(ev.data.message.currNo);</span>
<span class="cstat-no" title="statement not covered" >      if (allClientsDoNotNeed(ev.data.message.currNo)) {</span>
<span class="cstat-no" title="statement not covered" >        socket.emit(ev.data.eventName, ev.data.message);</span>
      }
    } else <span class="cstat-no" title="statement not covered" >if (ev.data.eventName == 'portClosing') {</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >      handleRoomsBeforeDel(port);</span>
<span class="cstat-no" title="statement not covered" >      conns.delete(port);</span>
<span class="cstat-no" title="statement not covered" >      port.close();</span>
    } else {
<span class="cstat-no" title="statement not covered" >      socket.emit(ev.data.eventName, ev.data.message);</span>
    }
&nbsp;
  }
}
function <span class="fstat-no" title="function not covered" >handleRoomsBeforeDel(</span>port) {
<span class="cstat-no" title="statement not covered" >  for (let currNo of port.rooms.values()) {</span>
<span class="cstat-no" title="statement not covered" >    port.rooms.delete(currNo);</span>
<span class="cstat-no" title="statement not covered" >    if (allClientsDoNotNeed(currNo)) {</span>
<span class="cstat-no" title="statement not covered" >      socket.emit('leaveRoom', { currNo });</span>
    }
  }
}
&nbsp;
function <span class="fstat-no" title="function not covered" >allClientsDoNotNeed(</span>currNo) {
<span class="cstat-no" title="statement not covered" >  for (let p of conns.values()) {</span>
<span class="cstat-no" title="statement not covered" >    if (p.rooms.has(currNo)) <span class="cstat-no" title="statement not covered" >return false;</span></span>
  }
<span class="cstat-no" title="statement not covered" >  return true;</span>
}
&nbsp;
//received messgae from nodejs server
<span class="cstat-no" title="statement not covered" >socket.on('allMessage', <span class="fstat-no" title="function not covered" >fu</span>nction (data) {</span>
<span class="cstat-no" title="statement not covered" >  for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i &lt; data.length; i++) {</span>
<span class="cstat-no" title="statement not covered" >    postAllMessage(data[i]);</span>
  }
});
&nbsp;
function <span class="fstat-no" title="function not covered" >postAllMessage(</span>data) {
<span class="cstat-no" title="statement not covered" >  for (let p of conns.values()) {</span>
<span class="cstat-no" title="statement not covered" >    if (p.rooms.has(data.currNo)) {</span>
<span class="cstat-no" title="statement not covered" >      p.postMessage(data);</span>
    }
  }
}</pre></td></tr></table></pre>

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